Vaillant flue extension 0.5 m, Ø 110 mm

Product detailed description

Extension for flue pipe Vaillant 0.5 m, Ø 110 mm (shaft system)

This single-wall pipe with a length of 0.5 m is intended for the so-called shaft system for exhaust of combustion gases, where the exhaust gases are led through a single pipe of Ø 110 mm placed in an existing vertical building shaft or chimney, while the combustion air for the boiler is drawn in through the free annular space between the pipe and the walls of the shaft. Unlike the concentric system Ø 110/160 mm (where both air and exhaust gases are led through one coaxial pipe), here the combustion air flows outside the pipe itself, directly in the shaft space – therefore, this part is used exclusively in combination with airtight sealed shafts with external air supply in the lower or upper part of the shaft according to the design.

The part is combined with other lengths (0.5 m and 1.0 m) and directional elements to the exact length of the vertical route in the shaft, while on the top and bottom of the assembly, transition and support components are connected to the boiler and to the exit from the shaft.

Summary of technical parameters

• Type of part: Extension (shaft system, single-wall)
• Diameter: Ø 110 mm
• System: Shaft system (LAS) – single-wall pipe, air flows freely in the shaft
• Length: 0.5 m
• Material: Polypropylene (PP), condensate resistance class W
• Temperature class: T120
• Pressure class: P1
• Type of connection: Bayonet lock with rubber sealing
• Application: ecoTEC plus high performance, ecoCRAFT exclusiv, ecoVIT exclusiv – installation in a shaft
• Country of origin: Germany / EU
• Brand: Vaillant
• Warranty: 24 months

Shaft system Vaillant Ø 110 mm (LAS)

The single-wall pipe Ø 110 mm is intended for the so-called shaft system for exhaust of combustion gases (also collectively referred to by the acronym LAS – air-gas system through a shaft), where the exhaust gases are removed through a single pipe placed in an existing masonry or prefabricated shaft/chimney, while the combustion air for the boiler is drawn in through the free annular space between this pipe and the walls of the shaft. This type of connection is mainly used for larger condensing gas boilers Vaillant (ecoTEC plus high performance, ecoCRAFT exclusiv, ecoVIT exclusiv) installed in apartment buildings, boiler rooms and machine rooms, where a vertical building shaft is available and it is not desirable to lead a separate concentric system through the façade.

The pipe is made of polypropylene (PP) with high resistance to condensate and acidic components of exhaust gases (class W according to EN 14471), temperature class T120, pressure class P1. The connections are solved by a locking neck system with rubber sealing, which ensures reliable gas tightness for vertical and slightly inclined routing in the shaft. Since the system operates in both negative and positive pressure modes depending on the type of boiler, each component must be from the certified range of Vaillant – combination with non-original parts from other manufacturers is not acceptable and is in conflict with the conditions of CE certification of the entire assembly and the boiler warranty.

Comparison with systems with an existing shaft and without it

In addition to concentric (double-wall) systems Ø 60/100, 80/125 and 110/160 mm, Vaillant also offers a single-wall solution Ø 110 mm for the shaft (LAS) installation method, to which this part also belongs. While concentric systems lead exhaust gases and combustion air through one coaxial pipe and are suitable mainly where the route leads through the façade or free space without an existing shaft, the single-wall shaft system uses an existing building shaft as a natural air channel around the exhaust pipe. The choice between the two approaches depends on the layout of the specific building – in reconstructions with an available original chimney shaft, the shaft system is usually structurally simpler and cheaper, while in new buildings without such a shaft, the concentric system is almost always chosen.

Compatibility

The extension 0.5 m Ø 110 mm is intended exclusively for the Vaillant shaft (LAS) system for exhaust of combustion gases, where the exhaust gases are led through this single-wall pipe and the combustion air flows freely in the space around it in the existing building shaft. It is used with the same boiler models as the concentric system Ø 110/160 mm (ecoTEC plus high performance, ecoCRAFT exclusiv, ecoVIT exclusiv), but differs in the method of supply of combustion air – it is not suitable to combine these two systems without a transition part specifically designed for this purpose.

Typical application scenarios

This short part is used for fine adjustment of the exact length of the vertical route in the shaft, when the remaining distance after assembling the longer extensions (1.0 m) does not correspond to an integer multiple – the 0.5 m variant allows for precise adjustment to the desired height without the need for any cutting of the pipe on site.

How to choose between the shaft and concentric system

Choose the shaft system Ø 110 mm (this part) when the building has an existing suitable vertical building shaft with a defined supply of combustion air – typically in reconstructions of apartment buildings with an original chimney body. If such a shaft is not available, or the route is to be led through the façade, the concentric system Ø 110/160 mm is the choice, where one pipe leads both exhaust gases and combustion air without the need for an existing shaft.

Installation and use

The 0.5 m extension is inserted into the vertical route in the shaft with the same bayonet lock with sealing as in the concentric system. During installation, it is necessary to:

• verify that the shaft meets the requirements for the supply of combustion air (free, unobstructed space, sufficient cross-section around the pipe, airtight separation from other parts of the building according to the design),
• stabilize the pipe in the shaft using distance brackets or rings so that the free cross-section for air flow is maintained around the entire circumference,
• maintain a minimum slope towards the boiler for condensate drainage,
• perform a tightness and functionality check of the air supply through the shaft before putting into operation according to the installation instructions for the specific boiler model,
• keep access to the inspection elements of the assembly (inspection T-elbow, inspection piece) in the lower part of the shaft for regular chimney inspections.

Safety warnings

Installation of the shaft (LAS) system for exhaust of combustion gases requires not only a professional installation company but also a prior assessment of the structural condition and suitability of the shaft by an authorized technician – an incorrectly dimensioned or leaky supply of combustion air through the shaft can endanger the safe operation of the boiler. Use only original Vaillant parts of the corresponding diameter; combination with non-original parts or any unauthorized modification (e.g., cutting the pipe) is not acceptable and is in conflict with the certification of the entire assembly and the boiler warranty. After installation or any intervention in the route, a tightness and functionality check of the air supply is necessary before putting the boiler into operation.

Maintenance and care

We recommend checking the exhaust system at least once a year during regular boiler service – especially the tightness of the connections, the passability of the condensate drain (if part of the assembly), and the mechanical fastening throughout the entire route. It is advisable to visually inspect the external plastic parts (roof extensions, through-pieces) after the winter period for possible mechanical damage from ice or wind. The inside of the pipes does not accumulate deposits during normal operation as in classic chimneys for solid fuel, but the inspection elements in the assembly (inspection elbows, inspection pieces, T-pieces) are precisely for this purpose, so that the service technician can easily look inside the pipe and clean it if necessary without the need to disassemble the entire route.

For boilers with a longer exhaust route, we recommend keeping a simple service record of the date of the last tightness check and the condition of the inspection openings – this will facilitate planning of further chimney inspections and provide clarity in the event of a complaint or property sale.

Why to buy this part at Atria.sk

We offer exclusively original Vaillant parts with 100% compatibility with exhaust systems of this brand – no universal replacements of questionable quality that could endanger the gas tightness of the entire assembly or void the boiler warranty. The product is usually in stock or quickly available from the supplier, so the boiler installation or service does not have to wait for one missing part. If you are unsure which exact part you need for your system, we will help you by phone or email – just provide the boiler model and the length of the exhaust route you need to cover.

We process orders within one working day and ship the product immediately if it is in stock. If you are unsure which exact part your project requires (for example, when combining multiple lengths and elbows into one route), we will gladly help you choose the correct set before ordering – just send us a floor plan or photo of the installation site and information about the boiler model.

Frequently asked questions